You’re reading too much into that. Point is that there is always plenty of room for disagreement. No two people think the same way on everything.
I am sure you are right about that. On both counts.
Should a person be excommunicated from any Church if he does not agree with 100% of some of the teachings?
That's an interesting consideration. I honestly don't know, but perhaps it depends on what one means by "teaching" and how crucial or central that teaching is? We are all sinners and we all, I have no doubt, misunderstand or get some things wrong in our life. How could we not? But, can a person simply reject a defined truth of the faith and still be a Catholic? How far does it go? I worked with a woman who said she was Catholic, and was raised that way, but denied that our Lord was God. I don't think she was any more Catholic than the Dalai Lama, formal excommunication or not. But, does the same hold true for one who rejects the primacy of Peter? Or the Virginity of our Lady? Or the indefectibility of the Church? I couldn't say. Maybe, but maybe not. That is not for me to say, thanks be to God.
OK......
1) I don’t agree that Mary was ALWAYS a virgin. She was married to Joseph and they had other children. The Bible ONLY states she was a virgin at the time of her conception. Someone made up this eternal virgin thing up.
2) I don’t agree the Church is perfect. It has made many mistakes over the centuries...naturally because it is run by human beings.
3) I don’t agree that priests have to be celibate. Married men are capable of doing the job just as well as single men.
I have always rejected the claim that if you don’t agree with 100% of what another Catholic says, you’re not a good Catholic and should not be part of the Church. I was taught by a Catholic priest that Jesus had brothers and sisters and this is written in the Bible. We should not be making things up.